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  <meta charset="UTF-8">
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  <title>Document</title>
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<body>
  <script>
    const obj = {
      uname: '张三'
    }
    function fn(a, b) {
      console.log(a + b);
    }
    fn.apply(obj, [23, 45])
    //第一个参数改变this指向，第二个要求必须是数组

    let arr = [23, 45, 65, 98]
    console.log(Math.max.apply(null, arr));
    console.log(Math.max.apply(Math, arr));
  </script>
</body>

</html>